code: def tearDown(self):
      super().tearDown()
      os.environ[
          "TF_TRT_ALLOW_ENGINE_NATIVE_SEGMENT_EXECUTION"
      ] = "False"
  
imports: import os
  from tensorflow.python.compiler.tensorrt import utils
  from tensorflow.python.compiler.tensorrt.test import tf_trt_integration_test_base
  from tensorflow.python.framework import constant_op
  from tensorflow.python.framework import dtypes
  from tensorflow.python.ops import array_ops
  from tensorflow.python.ops import image_ops_impl
  from tensorflow.python.platform import test
label_desc: Use image node_id 2 for calling the CombinedNmsExecuteNativeSegmentTest obj's underlying member method code with example usage: obj.tearDown() without return types